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Título: | Absorption and Transmission of Boundary Layer Noise through Micro-Perforated Structures: Measurements and Modellings |
Autor: | Maury, Cédric; Bravo, Teresa CSIC ORCID ; Mazzoni, Daniel | Fecha de publicación: | 30-abr-2021 | Editor: | Springer Nature | Citación: | Flinovia-Flow Induced Noise and Vibration Issues and Aspects-III: 227- 258 (2021) | Resumen: | Mitigating flow-induced noise is currently a major goal in the acoustic design of automotive and aircraft cabins. In order to avoid the introduction of active or massive components, structures made up of backed or unbacked micro-perforated panels (MPP) are potential lightweight solutions that could enhance the absorption and decrease the transmission of flow-induced noise. The present work describes experimental and modelling studies that examine the effect of MPPs, either flush-mounted or in a recessed configuration, on the wall-pressure fluctuations induced by a low-speed turbulent boundary layer (TBL) of air. The first part of this paper focuses on the vibro-acoustic properties of flush-mounted MPP-Cavity-Panel partitions forced by an aero-acoustic excitation. Parametric studies are carried out that show the influence of the MPP and of the excitation parameters on the absorption and transmission loss of the partition. In a second part, experimental studies and Lattice-Boltzmann simulations are presented that examine the effect of a recessed MPP, located at the floor of a shallow cavity, on the attenuation of the tunnel-cavity resonances and of the broadband noise components under a low-speed TBL. | Descripción: | International Conference on Flow Induced Noise and Vibration Issues and Aspects Flinovia—Flow Induced Noise and Vibration Issues and Aspects-III. FLINOVIA 2019; 32 páginas; 18 figuras | Versión del editor: | http://dx.doi.org/10.1007/978-3-030-64807-7 | URI: | http://hdl.handle.net/10261/264788 | DOI: | 10.1007/978-3-030-64807-7 | Identificadores: | doi: 10.1007/978-3-030-64807-7 isbn: 978-3-030-64807-7 |
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